[threeten-dev] Please help to review new test code for java.time.Period

[patrick zhang]

Hi Team,

Please help to review new test cases for java.time.Period.
Impacted method list is bleow.
plus()
minus()
minusDays()
minusYears()
minusMonths()

plusYears(). plusMonths() and plusDays are not touched since it has been 
included. And the new test code dose not introduce data provider. It 
just follow the old programming style of plusXXX().

webrev:
http://cr.openjdk.java.net/~pzhang/JSR310/java/time/Period/webrev/

test result:
http://cr.openjdk.java.net/~pzhang/JSR310/java/time/Period/TCKPeriod.jtr

Regards
Patrick